The most common and most likely answer to this crossword clue is the 8 letter word POINTING
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More clues leading to the result POINTING
Buddy explains!

The straight part
We know that "Way of indicating/ mortar between bricks" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case way of indicating/ mortar between bricks = pointing.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does POINTING mean?
POINTING verb- To extend the index finger in the direction of something in order to show where it is or to draw attention to it.
- To draw attention to something or indicate a direction.
- To face in a particular direction.
- (sometimes figurative) To direct toward an object; to aim.
- To give a point to; to sharpen; to cut, forge, grind, or file to an acute end.
- To indicate a probability of something.
- To repair mortar.
- To fill up and finish the joints of (a wall), by introducing additional cement or mortar, and bringing it to a smooth surface.
- (stone-cutting) To cut, as a surface, with a pointed tool.
- To direct or encourage (someone) in a particular direction.
- To separate an integer from a decimal with a decimal point.
- To mark with diacritics.
- To supply with punctuation marks; to punctuate.
- To direct the central processing unit to seek information at a certain location in memory.
- To direct requests sent to a domain name to the IP address corresponding to that domain name.
- To sail close to the wind.
- To indicate the presence of game by a fixed and steady look, as certain hunting dogs do.
- (of an abscess) To approximate to the surface; to head.
- To give point to (something said or done); to give particular prominence or force to.
- To appoint.
- The action of the verb to point.
- (usually singular or collective, sometimes proscribed) Mortar that has been placed between bricks to hold them together.
- The act or art of punctuating; punctuation.
- The rubbing off of the point of the wheat grain in the first process of high milling.
- The act or process of measuring, at the various distances from the surface of a block of marble, the surface of a future piece of statuary; also, a process used in cutting the statue from the artist's model.